quick fe oil mod question

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Nov 8, 2012 | 07:51 PM

#16

Jetcopterpilot

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From: Rossmoor at Seal Beach

My 352 with the mods can go to 6000 rpm no problem, and did on the dyno, and I have done it once since but I rarely ever run it over about 3200 rpm, not really much need to go any higher. At 2900 in high gear my GPS shows me at 65 mph.. and that is about as fast as I am willing to take the old girl anyway... I have had it up to 4500 rpm once in high gear, but I was checking for vibrations and that is good enough for me. I would like a higher top gear, but that will come with a new transmission by way of overdrive... dropping to tall of a rear end gear in these old rolling boxes just kills the mileage.. I have been looking at a Tremec TKO 600 Lots of gears to play with, great for a heavy truck...

When I am told by the PO that the engine was built by so and so or who's it, that is when I say let me see the paperwork on that... The PO's word carries no weight with me until I see the Proof...

Nov 8, 2012 | 10:24 PM

#17

66crawler

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Quote:

Originally Posted by jowilker

Dang in the 12 or so years that I have had my current slick, I think about 4500 is as fast as I have turned it, and that was in second gear.

With the 3.25 gearing 3,000 rpms has the speedo needle standing pretty tall. Don't know if it would achieve 5000 rpms in high gear.

John

I take mine up to 5k in 3rd every time I jump on the freeway, highest I've had it in 4th was about 4700 rpm and still pulling.

Nov 9, 2012 | 04:07 AM

#18

jowilker

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From: Creedmoor, North Carolina

Brother, I am going to say you have something lying to you. Turning 5000 getting onto the hi-way with a non balanced race engine is extreme. Having a setup for drag racing I believe it can be done, but a daily driver?? And get 10 mpg, I don't think so.

If you have a smart phone grab an app for GPS speedometer to see how close you actually are. Changing out big tires with out changing speedo drive gears will throw one off. It is all I can do to get 10 mph while trying to keep it in the 26-2700 rpm range. The more you turn an engine the more gas it sucks.

I'm sorry, no offense intended but those numbers don't add.

John

Nov 9, 2012 | 06:29 AM

#19

66crawler

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I don't judge anything off the spedometer, I know its off. I figured my mpg with GPS too, topping off before I left my house then finding the exact distance via GPS to the gas station I filled up at. X miles divided by gallons of fuel used right? It was actually a touch over 10mpg, at 3k-3500 rpm with a 4000ft elevation change going up hill. When I was really loaded up I went 100+ miles with the same elevation change and got 9mpg. The trick to mpg isn't cruising at the lowest rpm at a given speed, its staying inside your power band or torque band. It would take far less throttle input for me at 3200 rpm and 7? Mph then at 2500rpm and whatever mph going up the mountian pass.

Nov 9, 2012 | 06:37 AM

#20

66crawler

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It's about engine vacuum not rpm, more vacuum=more fuel. If you get less vacuum at 3000 rpm cruising in your truck them at 2500 rpm you will save fuel. The lake I go to is 74 miles from my door up in the mountians, 5000+ ft elevation change, my truck has the factory 18 gallon tank behind the seat and I have no problem making it there and back without refueling. Motor has around 10:1 compression, electronic ignition, mid range cam, Sanderson headers, 2.25in exhaust with 13in glass packs, edelbrock carb, Jacobs racing wires, 4 speed with 456 gears and 35in tires, oh and its 4x4.